component

TL431BQDBZRQ1

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by Ray

Texas Instruments Voltage Reference, SOT-23-3. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentpower management (pmic)tl431bqdbzrq1
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Datasheet

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Contents

README

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TL431BQDBZRQ1

Texas Instruments · Voltage Reference · SOT-23-3

TL431BQDBZRQ1 from Texas Instruments, in a SOT-23-3. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 CATHODE passive Shunt current or voltage input. Cathode of the internal shunt regulator; conducts current when REF exceeds VREF (2.495 V typ). Recommended operating range VREF to 36 V, cathode current 1-100 mA; dynamic impedance 0.2 Ω typ.
2 REF input Reference/threshold input relative to ANODE. Compared internally against the 2495 mV bandgap reference; drives the shunt element to regulate CATHODE voltage. IREF is 2 µA typ (4 µA max).
3 ANODE power_in Common pin, normally connected to ground. Serves as the reference return for both the REF input and the CATHODE shunt current.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOT-23-3
Category Power Management (PMIC)
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • TL431BQDBZRQ1
  • TL431BQDBZRQ1DBVR
  • TL431BQDBZRQ1DBVT

CAD (KiCad official)

  • Symbol: TL431BQDBZRQ1
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (31 pp, sha256 6e78e952a7d3e8bc, retrieved 2026-08-17, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF